Research Article
Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels
@INPROCEEDINGS{10.4108/icst.crowncom.2012.248283, author={Ricardo Blasco-Serrano and Jing Lv and Ragnar Thobaben and Eduard Jorswieck and Adrian Kliks and Mikael Skoglund}, title={Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels}, proceedings={7th International Conference on Cognitive Radio Oriented Wireless Networks}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2012}, month={7}, keywords={overlay underlay cognitive radio spectrum sharing multiple antenna}, doi={10.4108/icst.crowncom.2012.248283} }- Ricardo Blasco-Serrano
Jing Lv
Ragnar Thobaben
Eduard Jorswieck
Adrian Kliks
Mikael Skoglund
Year: 2012
Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels
CROWNCOM
IEEE
DOI: 10.4108/icst.crowncom.2012.248283
Abstract
We consider an extension of the cognitive radio channel model in which the secondary transmitter has to obtain (``learn") the primary message in a first phase rather than having non-causal knowledge of it. We propose an achievable rate region that combines elements of decode--and--forward relaying with coding for the pure cognitive radio channel model. Moreover, we find the choice of parameters that maximize the secondary rate under a primary rate constraint. Finally, we compare numerically the performance of our system to that of an underlay scheme that combines beamforming, rate splitting, and successive decoding. We observe that although the overlay design provides higher rates, the losses due to the first phase are quite severe. In fact, for the considered scenarios, cleverly designed underlay schemes can provide comparable performance.
